US3552096A - Apparatus for drying air or other gas - Google Patents
Apparatus for drying air or other gas Download PDFInfo
- Publication number
- US3552096A US3552096A US652550A US3552096DA US3552096A US 3552096 A US3552096 A US 3552096A US 652550 A US652550 A US 652550A US 3552096D A US3552096D A US 3552096DA US 3552096 A US3552096 A US 3552096A
- Authority
- US
- United States
- Prior art keywords
- gas
- valve
- cam
- valves
- tank
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
- B01D53/261—Drying gases or vapours by adsorption
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
- B01D53/0407—Constructional details of adsorbing systems
- B01D53/0446—Means for feeding or distributing gases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
- B01D53/0454—Controlling adsorption
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/44—Mechanical actuating means
- F16K31/48—Mechanical actuating means actuated by mechanical timing-device, e.g. with dash-pot
- F16K31/485—Mechanical actuating means actuated by mechanical timing-device, e.g. with dash-pot and specially adapted for gas valves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/80—Water
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/40003—Methods relating to valve switching
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/40083—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption
- B01D2259/40086—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by using a purge gas
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/402—Further details for adsorption processes and devices using two beds
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/8593—Systems
- Y10T137/86389—Programmer or timer
- Y10T137/86405—Repeating cycle
- Y10T137/86413—Self-cycling
Definitions
- a gas processing apparatus employing effluent gas to drive a timing and switching apparatus and a gas driven timing and switching apparatus are provided by this invention.
- the timing and switching apparatus employs a turbine driven by gas flow to drive and time the actuation of a plurality of valves which control flow to a plurality of lines.
- the gas processing apparatus provides the flow of eflluent fluid which is employed to drive the turbine.
- This invention relates to an apparatus for drying air or other gas (hereinafter generally referred to as gas) and more particularly to a valve switching system for such apparatus.
- a known type of drying apparatus called a desiccant dryer, is, for example, described in U.S. patent specification No. 2,944,627 dated July 12, 1960 and No. 3,069,830 dated Dec. 25, 1962.
- These specifications describe an apparatus for fractionating gaseous mixtures employing two tanks, of which one is normally on stream in a cycle called the adsorption cycle, because it removes by adsorption a selected component from a gas mixture, and of which the other is on a cycle called the desorption cycle, because it is being regenerated by the passage through it of a portion of the eflluent from a fractionating tank.
- the influent gaseous mixture is then diverted to the tank just regenerated, using appropriate valving.
- This known apparatus is operated without the application of heat, and this is achieved by carrying out of the fractionation or adsorp tion at a superatmospheric pressure, the desorption or regeneration being carried out at atmospheric pressure.
- very short cycles are employed, generally not exceeding two or three minutes, and preferably less than one minute.
- the infiuent gaseous mixture is very frequently shifted from the one tank to the other and at the end of each cycle the pressure of ags in each tank must be rapidly adjusted to the proper pressure for adsorption or for the desorption, as required.
- This known apparatus uses a group of valves for this purpose, these valves being automatically operated by means of a cycle timing device.
- timing devices require a source of electricity, which is not always available, and if it is available, is subject to power failures.
- electrical equipment has the additional disadvantage of requiring expensive explosion proof equipment when the apparatus is to be used in hazardous areas.
- the present invention provides a simple, inexpensive, satisfactory valving and timer system which is gas timed by the efliuent gas from the adsorptions or fractionating tank, via a gas or air motor and associated cams, gears and valves to control gas flow, and does not require the use of an electrically operated valving system.
- the timing mechanism and flow controls can be automatically set to provide the necessary adjustment of the pressure of the tank in changing from the adsorption to desorption cycles, and vice versa, as well as to provide for a suitable cycle for the repressurization and adsorption and desorption operations.
- the motive force for switching the cycling valves of a drying apparatus is provided by an air or gas motor, that is operated by gas effluent from the dryer.
- the timing of the interval between switching operations of the system is controlled by a cam also operated by the air or gas motor, and timing is adjusted to meet any system requirements by control of the rate of rotation of the cam, and the shape and circumference of the cam surface.
- the rate of rotation of the motor can be adjusted to control the rate of rotation of the cam.
- valve-switching system finds its best use in control of gas flow to gas operated valves in the various lines of the drying apparatus, so'that all flow is in effect gas-controlled and gas-operated, eliminating electrical solenoid valves.
- a timing device such as a cam operable to control the switching valves
- efiluent gas from the dryer is an important feature of the present invention.
- Air or gas motors normally are operated by compressed air from a compressor or other source, but they have a notoriously short life, and consequently have found only a limited field of usefulness.
- Use of dry gas efiluent not only avoids the need for a separate source'of supply of operating air but also ensures a pure gas that considerably extends the life of the motor. It also links operation of the motor with the operations of the dryer in such a way that the cycle is not lost when the dryer is shut down, since the timer operates only while gas eflluent is being supplied to it.
- the efliuent furthermore can be recovered and returned to the drying apparatus, if it is too valuable to vent to the atmosphere.
- valves actuation of which is effected by the valving system of the invention, can be arranged so as to be independently actuated, each by its own timing cam and cam follower. This permits maximum flexibility of timed sequence of operation.
- the valves are operated by cam-followers which are displaced by a single rotatable cam driven by the air motor, and the air or gas motor is a turbine driven by the gas bled from the outlet conduit under the control of a pressure reducing valve; a reduction gear is arranged between the turbine and the cam.
- the valves are mounted on a base (which may be the base of a valve housing) and are interconnected by passages in the form of grooves or routings in the base. This results in a simple, inexpensive, compact valving system which has low susceptibility to gas leakage and facilitates replacement of the component valves as desired.
- the air or gas motor that is employed is of conventional design, and is commercially available. It is unusual, however, in that it is operated at low r.p.m., preferably below 5000 r.p.m. It comprises a gas-operated turbine, a shaft driven by the turbine that operates the cam, and if desired a reduction or multiplication gear system to obtain any desired cam rotation speed. A brake can also be provided to prevent excessively high r.p.m. The gas is projected at the vanes on the turbine to operate the motor.
- FIG. 1 is a plan view in schematic form, of a valve switching system according to this invention, with parts partly broken away for better representation.
- FIG. 2 is a side view of the valve switching system of FIG. 1, with parts partly broken away for better representation.
- FIG. 3 is a bottom view of the valve switching system of FIG. 1, showing the ducting recessed in the plate for gas connections among the various parts.
- positions 1 to 4 are schematic diagrams illustrating the valving system according to the present invention at four operating positions.
- FIG. 5 is a schematic view of a dryer apparatus including a valve switching system operating all the valves by a single cam.
- FIG. 6 is a plan view of another embodiment of valve switching system of the invention.
- a plurality of switching valves 1, 2, 3 and 4 are mounted on a base plate 11. These valves are spool valves which may be of known construction and are shown diagrammatically in FIG. 4.
- the valves 1, 2 have cam followers 12, 12 which are displaced by movement of a cam cut at 24 to depress cam followers 12, 12' for 150 of a cycle.
- the cam 7 is rotatable about an axis perpendicular to the base 11 by an air turbine motor 8.
- the air motor has a turbine speed of 1200 r.p.m., and is operated by 0.5 s.c.f.rn. of gas bled via line H from the dried gas outlet conduit of the drying apparatus of FIG 5.
- the gas initially at a high pressure say of about 60 to 150 p.s.i. passes from the conduit into a pressure reducing and regulating valve 5 whence it passes now at 25 p.s.i., via a pressure gauge 6 to the turbine 14 of the air motor via line 15 via jet orifice 18 which directs it downwardly against the vanes of the turbine.
- the turbine 14 may be of metal or plastic, such as polyethylene, polypropylene, nylon or Teflon (registered trademark) and is mounted on a shaft 20 with a centrifugal speed governor 21.
- the shaft 20 is connected with an output shaft through a reduction gearing 16, 17.
- the cam 7 is mounted on the output shaft 25, and rotates therewith.
- the device shown is set for an ten minute cycle, with the cam followers depressed for of the cycle, or approximately four minutes. Obviously any type and duration of operation of the cam followers can be provided for by merely changing the arc of the cut out portions. Two actuations can be obtained per cycle by two cutout portions and so on.
- valves 1, 2, 3, 4 are sufficient to actuate four valves 1, 2, 3, 4, by arrangement on the base 11.
- Each of valves 1 and 2 is so placed that the cam 7 actuates their respective cam followers 12, 12 in timed sequence best followed in FIG. 4.
- Valves 1 and 3 are interconnected by routing A in the base 11 so that when valve 1 is brought into position 1 of FIG. 4, valve 3 is also actuated by gas from valve 1, into position and in the same way valves 2 and 3 are interconnected by line routing B' so that when valve 2 is brought into the position 3 of FIG. 4, valve 3 is also actuated by gas from valve 2 to the position 3.
- Inlet air proceeds via port hand routing H in the base 11 to valve 4, valve 5, valve 1 and valve 2.
- Valve Nos. 1 and 2 are four way spool valves, lever bled, and actuated by cam followers 12, 12' respectively, into positions 1 and 3, respectively, of FIG. 4.
- Valve No. 3 is a three way spool valve, double pilot operated (via lines A and B).
- Valve No. 4 is a four way spool valve, double pilot operated (from valve 2 via routing B and from valve 1 via routing A, so that valve 4 is brought to position 1 when valve 1 is actuated, and to positions 3 when valve 2 is actuated).
- valve 1 is connected to purge exhaust valve 40 via line A
- valve 2 is connected to exhaust valve 41 via line B
- Valve 3 is connected to repressurizing valve 42 via line E
- valve 4 is connected via lines F and G to inlet switching valves 43, 44 respectively.
- the valves 40, 41 and 42 are opened by gas pressure and self-closing when pressure is reduced.
- Valves 43 and 44 are closed by gas pressure and self-Opening when pressure is reduced.
- the system can also be arranged to utilize ball valves if desired.
- the valve switching systems itself indicated generally at 39 is operated via gas efiluent supplied thereto by line H.
- the valves 40, 41, 43, 44 are of the two-way type, but could be of the multi-port type if desired.
- the two-way valves are designed so that if there is failure in the air supply to the control unit the dryer controlled by the spool valves assumes a fail-safe position i.e. the wet gas influent valves are open to both tanks and the purge gas exhaust valves are closed to both tanks.
- valve 1 will be directed by the valve 1 into passage C to valve 3, which feeds it through line E to repressurization valve 42 opening it.
- the gas that was in the line A exhausts, and the loss of pressure from the line A closes the exhaust valve 40 of the tank RT. This permits repressurization of tank RT. Meanwhile, gas continues to flow through tank LT.
- valve 43 Gas passes through valve 43 into tank RT of the bottom, and purse gas effluent enter tank LT at the top, and vents at valve 41.
- This cycle continues while the cam 7 holds cam follower 12 depressed through 150 of arc, about four minutes, the same as with cam follower 12 of valve 1.
- cam follower 12' enters the cutout portion 24 of cam 7, but cam follower 12 has not yet reached the end of this portion, and will not for another 30 of arc. The result is that valve 2 is shifted to the position 4 of FIG. 4.
- the turbine 8 after about one minute rotates to bring the cam 8 to the position 1 shown in FIG. 4 and the cycle repeats itself.
- the cam-operated switching system of FIG. 6 utilizes a separate cam for each valve, and each valve is provided with a cam follower.
- the air or gas motor is of exactly the same type as shown in FIGS. 1 and 3, and is operated by gas eifuent in the same manner as that of FIGS. 1 to 5, via line H.
- the valves 1, 2, 3, 4 find their duplicates in the system of FIG. 6, and since they operate the gas dryer in the same way, reference to FIG. will show how the system of FIG. 6 operates the switching valves of the dryer.
- the system of FIG. 6 includes four cams 50, 51, 52, 53, all mounted on a common driven shaft 54 which is rotated via reduction gears 59 as in the system of FIGS. 1 to 3, from the turbine shaft of the air motor 56. Hence, all cams rotate at the same speed.
- Cams 50 and 52 have cut out portions extending over 210 of arc, with a resulting cam follower depressing portion extending over 150 of arc.
- Cam 51 has two cut out portions, each extending over 150 of arc, and two cam followers depressing portions extending over 30 of arc.
- Cam 53 has a cut out portion extending over 180 of arc.
- Cams 50 and 52 operate valves 1 and 2 respectively.
- Cam 51 operates valve 3
- cam 53 operates valve 4.
- cam 50 operates valve 1 via its cam follower 60 into position 1 during 150 of arc; during positions 2, 3 and 4 cam follower 60 is not actuated, and the valve assumes the position shown.
- Cam 52 operates valve 2 via its cam follower 62 into position 3 during 150 of arc; during positions 1, 2 and 4 cam follower 62 is not actuated, and the valve assumes the position shown.
- Cam follower 61 is actuated by cam 51 twice per cycle, each time bringing valve 3 to a position to feed gas to valve 42 via line B. In this system, valve 3 receives gas directly from line H instead of via valves 1 and 2 as in the system of FIGS.
- the position shown in position 2 of FIG. 4 is the on position, wherein gas can pass from line H to line E, the position shown in position 3 is the off position.
- the valve is on twice per cycle for 30 of arc, at the timed intervals represented in positions 2 and 4 of FIG. 4, over minute, approximately in actuations.
- valve 4 which also is fed directly from line H is actuated by cam 53 and its cam follower 63 for of arc, approximately five minutes of each cycle, corresponding to positions 1 and 2 of FIG. 4, and is not actuated for 180 of arc, corresponding to positions 3 and 4 of FIG. 4.
- the valves of the dryer of FIG. 5 can be operated in exactly the same timed sequence as the switching system of FIGS. 1 to 3. It is apparent that by appropriate adjustment of the cam surfaces and their positions with respect to each other, as well as of the rate of rotation of the shaft 54, any timed series of actuations can be obtained, as well as any desired total length of cycle. As in the system of FIGS. 1 to 3 one complete rotation of the cam assembly defines one full cycle.
- An apparatus for'processing gas comprising, in combination, gas processing means having at least two gas processing vessels, each vessel having an inlet and an outlet; valve means operable to control gas flow to and from each vessel; and a timing and switching apparatus for opening and closing the valve means at predetermined times for predetermined intervals to direct flow to and from the vessels at such times and intervals, said timing and switching apparatus comprising a gas inlet; at least two gas outlets; a turbine in fluid flow connection with the gas inlet of the timing and switching apparatus and driven by gas fiow therefrom; a drive shaft mounted to rotate with said turbine; at least two valves in the housing, each controlling flow to an outlet of the timing and switching apparatus: eccentric timing means operatively connected to the drive shaft, and adapted to actuate the valves and control the duration of said actuation according to the rate of rotation of the turbine, and a plurality of passages selectively connecting the gas inlet of the timing and switching apparatus with a gas outlet thereof according to the position of said eccentric timing means to direct and control flow to the outlets; the gas in
- An apparatus for processing gas in accordance with claim 2 including a dessicant in each vessel.
- valves operable to control flow of gas to and from each vessel are gas actuated valves operated by gas pressure.
Abstract
Description
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB31539/66A GB1168102A (en) | 1966-07-13 | 1966-07-13 | A Timing and Switching Valve Apparatus and an Apparatus for Processing Air or other Gas including the same |
Publications (1)
Publication Number | Publication Date |
---|---|
US3552096A true US3552096A (en) | 1971-01-05 |
Family
ID=10324621
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US652550A Expired - Lifetime US3552096A (en) | 1966-07-13 | 1967-07-11 | Apparatus for drying air or other gas |
Country Status (6)
Country | Link |
---|---|
US (1) | US3552096A (en) |
BE (1) | BE701304A (en) |
DE (1) | DE1619901B2 (en) |
GB (1) | GB1168102A (en) |
NL (1) | NL6709753A (en) |
SE (1) | SE335850B (en) |
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3757492A (en) * | 1970-05-23 | 1973-09-11 | R Graff | Adsorber method and apparatus |
US3876397A (en) * | 1973-01-02 | 1975-04-08 | John C Taylor | Adsorbing apparatus |
US4039306A (en) * | 1973-01-02 | 1977-08-02 | Taylor John C | Adsorber apparatus |
US4113451A (en) * | 1977-06-08 | 1978-09-12 | Graham-White Sales Corp. | Compressed gas filter assembly |
US4247311A (en) * | 1978-10-26 | 1981-01-27 | Pall Corporation | Downflow or upflow adsorbent fractionator flow control system |
US4295863A (en) * | 1979-06-06 | 1981-10-20 | S.T.I. Strumentazione Industriale S.P.A. | Method for automating and optimizing the operative cycle in adsorption dehydration plants |
US4331457A (en) * | 1978-02-20 | 1982-05-25 | Sab Industri Ab | Device preferably for driers for compressed air |
US4468239A (en) * | 1983-01-07 | 1984-08-28 | Roanoke College | Twin tower assembly for decontaminating compressed gas |
US4509959A (en) * | 1983-07-28 | 1985-04-09 | Greene & Kellogg, Inc. | Modular industrial oxygen concentrator |
US4530705A (en) * | 1984-04-16 | 1985-07-23 | Firey Joseph C | Cyclic gas separator |
US4559065A (en) * | 1984-03-15 | 1985-12-17 | Wilkerson Corporation | Twin tower gas fractionation apparatus |
US4631073A (en) * | 1984-03-15 | 1986-12-23 | Wilkerson Corporation | Method and apparatus for theadsorptive fractionation of gases |
US4738692A (en) * | 1986-02-14 | 1988-04-19 | Fresch Vincent P | Gas drying apparatus |
US4802899A (en) * | 1987-09-21 | 1989-02-07 | Airsep Corporation | Pressure swing adsorption apparatus |
US20040083893A1 (en) * | 2001-01-29 | 2004-05-06 | Sven-Olof Larsson | Modular air supply |
US20050139070A1 (en) * | 2003-12-31 | 2005-06-30 | Merits Health Products Co., Ltd. | Rapid cycle pressure swing adsorption oxygen concentration method and mechanical valve for the same |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4101298A (en) * | 1977-04-05 | 1978-07-18 | The Bendix Corporation | Pressure cycling control for fluid separator mechanism |
GB8623605D0 (en) * | 1986-10-01 | 1986-11-05 | Normalair Garrett Ltd | Aircraft on-board gas generating apparatus |
GB8900506D0 (en) * | 1989-01-10 | 1989-03-08 | Willpower Compressed Air Syst | Compressed gas purifier |
EP0525521A1 (en) * | 1991-08-01 | 1993-02-03 | Mitsubishi Jukogyo Kabushiki Kaisha | Gas separator system |
-
1966
- 1966-07-13 GB GB31539/66A patent/GB1168102A/en not_active Expired
-
1967
- 1967-07-11 DE DE19671619901 patent/DE1619901B2/en active Pending
- 1967-07-11 US US652550A patent/US3552096A/en not_active Expired - Lifetime
- 1967-07-13 NL NL6709753A patent/NL6709753A/xx unknown
- 1967-07-13 SE SE10532/67A patent/SE335850B/xx unknown
- 1967-07-13 BE BE701304D patent/BE701304A/xx not_active IP Right Cessation
Cited By (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3757492A (en) * | 1970-05-23 | 1973-09-11 | R Graff | Adsorber method and apparatus |
US3876397A (en) * | 1973-01-02 | 1975-04-08 | John C Taylor | Adsorbing apparatus |
US4039306A (en) * | 1973-01-02 | 1977-08-02 | Taylor John C | Adsorber apparatus |
US4113451A (en) * | 1977-06-08 | 1978-09-12 | Graham-White Sales Corp. | Compressed gas filter assembly |
US4331457A (en) * | 1978-02-20 | 1982-05-25 | Sab Industri Ab | Device preferably for driers for compressed air |
US4247311A (en) * | 1978-10-26 | 1981-01-27 | Pall Corporation | Downflow or upflow adsorbent fractionator flow control system |
US4295863A (en) * | 1979-06-06 | 1981-10-20 | S.T.I. Strumentazione Industriale S.P.A. | Method for automating and optimizing the operative cycle in adsorption dehydration plants |
US4468239A (en) * | 1983-01-07 | 1984-08-28 | Roanoke College | Twin tower assembly for decontaminating compressed gas |
US4509959A (en) * | 1983-07-28 | 1985-04-09 | Greene & Kellogg, Inc. | Modular industrial oxygen concentrator |
US4559065A (en) * | 1984-03-15 | 1985-12-17 | Wilkerson Corporation | Twin tower gas fractionation apparatus |
US4631073A (en) * | 1984-03-15 | 1986-12-23 | Wilkerson Corporation | Method and apparatus for theadsorptive fractionation of gases |
US4530705A (en) * | 1984-04-16 | 1985-07-23 | Firey Joseph C | Cyclic gas separator |
US4738692A (en) * | 1986-02-14 | 1988-04-19 | Fresch Vincent P | Gas drying apparatus |
US4802899A (en) * | 1987-09-21 | 1989-02-07 | Airsep Corporation | Pressure swing adsorption apparatus |
US20040083893A1 (en) * | 2001-01-29 | 2004-05-06 | Sven-Olof Larsson | Modular air supply |
US6824594B2 (en) * | 2001-01-29 | 2004-11-30 | Halder Brake Products Ab | Modular air supply |
US20050139070A1 (en) * | 2003-12-31 | 2005-06-30 | Merits Health Products Co., Ltd. | Rapid cycle pressure swing adsorption oxygen concentration method and mechanical valve for the same |
US7637989B2 (en) * | 2003-12-31 | 2009-12-29 | Merits Health Products Co., Ltd. | Rapid cycle pressure swing adsorption oxygen concentration method and mechanical valve for the same |
Also Published As
Publication number | Publication date |
---|---|
SE335850B (en) | 1971-06-14 |
GB1168102A (en) | 1969-10-22 |
NL6709753A (en) | 1968-01-15 |
DE1619901A1 (en) | 1970-08-13 |
DE1619901B2 (en) | 1971-09-02 |
BE701304A (en) | 1968-01-15 |
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